Update and rename 2.5.20.md to 3.4.1.md

Author: yaira2

2.5.20.md

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+**Changes in v3.4.1**
+
+- Added support for displaying all network folders on the sidebar
+- Added support for SeerPro's "Track selected file" setting
+- Added toolbar button to play mkv files
+- Added support for setting tif files as the Background Image
+- Updated the wording of the "Files is running as admin" prompt
+- Fixed an issue where the app wouldn’t run as admin
+- Fixed crash when connecting some removable drives
+- Fixed an issue where the string for "Actions" wasn't localize in the Settings menu